Cichlids are aggressive towards each other but i don't think blood parrot are aggressive.I've ever kept 2 in a 14 gallon.

What size were the blood parrots u had?
Realy any size of blood parrot is to big for a 14gal and you had 2 of them in there. The waste they produce would build up so quickly in a 14gal and they would have no where to swim.